From 1dff7f3db5f045ccbfeca5bb00b0958a78501557 Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@suse.de>
Date: Sat, 5 Nov 2005 17:25:53 +0100
Subject: [PATCH] [PATCH] x86_64: Fix up outdated pfn_to_page comment
pfn_to_page really requires pfn_valid to be true now, no question.
Some people stumbled over it, but it was misleading and wrong.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
include/asm-x86_64/mmzone.h | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/include/asm-x86_64/mmzone.h b/include/asm-x86_64/mmzone.h
index b40c661f111e..8d48dc7e43a7 100644
--- a/include/asm-x86_64/mmzone.h
+++ b/include/asm-x86_64/mmzone.h
@@ -41,9 +41,7 @@ static inline __attribute__((pure)) int phys_to_nid(unsigned long addr)
#define pfn_to_nid(pfn) phys_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
#define kvaddr_to_nid(kaddr) phys_to_nid(__pa(kaddr))
-/* AK: this currently doesn't deal with invalid addresses. We'll see
- if the 2.5 kernel doesn't pass them
- (2.4 used to). */
+/* Requires pfn_valid(pfn) to be true */
#define pfn_to_page(pfn) ({ \
int nid = phys_to_nid(((unsigned long)(pfn)) << PAGE_SHIFT); \
((pfn) - node_start_pfn(nid)) + NODE_DATA(nid)->node_mem_map; \